With any luck, I'll be revisiting the early days of my video game collection hobby soon, having acquired another Atari Super Pong Ten system. I found my first one in a trash pile, still in the box, in the early '90s. It worked for awhile, but eventually the picture went screwy, and it went into storage. I actually still have it, but it's seen better days, as have the external controllers. This "new" one has its issues (one of the external controller ports is a bit messed up), but looks fine otherwise. Just gotta find a bunch of D-cells, and try it out.
-Adam

EDIT: Borrowed some batteries from a boombox, and tried it out. The RF modulator is a bit flaky, but the main unit and both of the external controllers work! Can't wait to organize a 4-player game of Super Pong!